Codecademy - movies hash

movies_hash.rb

def get_title
  print 'Enter movie title: '
  title = gets.chomp

  if title.length < 1
    print 'Invalid title!'
    return nil
  else
    return title.to_sym
  end
end
  
def get_rating(title)
  print "Enter rating for movie '#{title}': "
  rating = gets.chomp

  if rating.length > 1
    print 'Invalid rating'
    return nil
  end
  
  rating = rating.to_i

  if rating < 0 or rating > 4
    print 'Invalid rating'
    return nil
  else
    return rating
  end
end

movies = {
  :Avatar => 4,
  :'Lord of the Rings' => 3
}

print 'Enter action: '
choice = gets.chomp

case choice.downcase
when 'add'
  title = get_title

  if title.nil?
    # Do nothing
  elsif !movies[title].nil?
    puts 'Entry already exists'
  else
    rating = get_rating title

    unless rating.nil?
      movies[title] = rating
      puts "Added pair :#{title} => #{rating}"
    end
  end
when 'update'
  title = get_title
  
  if title.nil?
    # Do nothing
  elsif movies[title].nil?
      puts "Entry doesn't esist"
  else
    rating = get_rating title

    unless rating.nil?
      movies[title] = rating
      puts "Updated pair: :#{title} => #{rating}"
    end
  end
when 'display'
  movies.each do |movie, rating| puts "#{movie}: #{rating}"; end
when 'delete'
  title = get_title
  
  if title.nil?
    # Do nothing
  elsif movies[title].nil?
      puts "Entry doesn't esist"
  else
    movies.delete title
    puts "Deleted movie '#{title}'"
  end
else
  puts 'Invalid command!'
end